package com.sky.service.impl;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.OrdersCancelDTO;
import com.sky.dto.OrdersConfirmDTO;
import com.sky.dto.OrdersPageQueryDTO;
import com.sky.dto.OrdersPaymentDTO;
import com.sky.dto.OrdersRejectionDTO;
import com.sky.dto.OrdersSubmitDTO;
import com.sky.entity.AddressBook;
import com.sky.entity.OrderDetail;
import com.sky.entity.Orders;
import com.sky.entity.ShoppingCart;
import com.sky.entity.User;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.AddressBookMapper;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.mapper.UserMapper;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;

import lombok.extern.slf4j.Slf4j;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private OrderDetailMapper orderDetailMapper;

    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatPayUtil weChatPayUtil;

    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     *
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    @Transactional
    public OrderSubmitVO submit(OrdersSubmitDTO ordersSubmitDTO) {
        // 处理业务异常
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        // 查询购物车数据
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(userId).build();

        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());// 订单下单时间
        orders.setPayStatus(Orders.UN_PAID);// 设置支付状态
        orders.setStatus(Orders.PENDING_PAYMENT); // 设置订单状态
        orders.setNumber(String.valueOf(System.currentTimeMillis()));// 设置订单号
        orders.setPhone(addressBook.getPhone()); // 设置收货人电话
        orders.setConsignee(addressBook.getConsignee()); // 设置收货人姓名
        orders.setUserId(userId);
        // 向订单表插入一条数据
        orderMapper.insert(orders);
        // 向订单明细表插入n条数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        shoppingCartList.forEach(e -> {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(e, orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        });
        orderDetailMapper.insertBatch(orderDetailList);
        // 删除购物车数据
        shoppingCartMapper.delete(shoppingCart);
        // 封装返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderAmount(orders.getAmount())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .build();
        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    @Override
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        // 调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), // 商户订单号
                new BigDecimal(0.01), // 支付金额，单位 元
                "苍穹外卖订单", // 商品描述
                user.getOpenid() // 微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    @Override
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
        // 通过websocket向客户端推送消息
        Map<String, Object> map = new HashMap<>();
        map.put("type", 1);// 1表示来单提醒
        map.put("orderId", ordersDB.getId());
        map.put("content", "订单号: " + outTradeNo);
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 用户催单
     */
    @Override
    public void reminder(Long id) {
        Orders orders = orderMapper.getById(id);
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        Map<String, Object> map = new HashMap<>();
        map.put("type", 2);// 2表示催单提醒
        map.put("orderId", orders.getId());
        map.put("content", "订单号: " + orders.getNumber());
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 订单分页查询
     *
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(OrdersPageQueryDTO ordersPageQueryDTO) {
        Long userId = BaseContext.getCurrentId();
        ordersPageQueryDTO.setUserId(userId);
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = (Page<Orders>) orderMapper.pageQuery(ordersPageQueryDTO);
        List<OrderVO> orderList = new ArrayList<>();
        if (page != null) {
            page.forEach(e -> {
                Long orderId = e.getId();
                List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderId);
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(e, orderVO);
                orderVO.setOrderDetailList(orderDetailList);
                orderList.add(orderVO);
            });
        }
        return new PageResult(page.getTotal(), orderList);
    }

    /**
     * 再来一单
     * 
     * @param id
     */
    @Override
    public void repetition(Long id) {
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 订单详情
     *
     * @param id
     * @return
     */
    @Override
    public OrderVO detail(Long id) {
        // 根据订单id获取订单对象，
        Orders orders = orderMapper.getById(id);
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        // 根据订单id获取菜品数据
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        // 封装对象并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    /**
     * 用户取消订单
     *
     * @param id
     */
    @Override
    public void userCancelById(Long id) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        // 订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (ordersDB.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());

        // 订单处于待接单状态下取消，需要进行退款
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            // 调用微信支付退款接口
            weChatPayUtil.refund(
                    ordersDB.getNumber(), // 商户订单号
                    ordersDB.getNumber(), // 商户退款单号
                    new BigDecimal(0.01), // 退款金额，单位 元
                    new BigDecimal(0.01));// 原订单金额
            // 支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }

        // 更新订单状态、取消原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 条件搜索订单
     *
     * @param ordersPageQueryDTO
     * @return
     * 
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = (Page<Orders>) orderMapper.pageQuery(ordersPageQueryDTO);
        List<OrderVO> orderVOList = getOrderVOList(page);
        return new PageResult(page.getTotal(), orderVOList);
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }

    /**
     * 管理端取消订单
     */
    @Override
    public void adminCancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus == 1) {
            // 用户已支付，需要退款
            String refund;

            refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));

            log.info("申请退款：{}", refund);
        }
        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 统计订单数据
     */
    @Override
    public OrderStatisticsVO statistics() {
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setConfirmed(orderMapper.countStatus(Orders.CONFIRMED));
        orderStatisticsVO.setToBeConfirmed(orderMapper.countStatus(Orders.TO_BE_CONFIRMED));
        orderStatisticsVO.setDeliveryInProgress(orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS));
        return orderStatisticsVO;
    }

    /**
     * 订单完成
     * 
     */
    @Override
    public void complete(Long id) {
        // 查询订单
        Orders ordersDB = orderMapper.getById(id);
        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        // 更改订单状态为已完成
        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.COMPLETED)
                .deliveryTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    /**
     * 接单
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        // 查询订单
        Orders ordersDB = orderMapper.getById(ordersConfirmDTO.getId());
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 拒单
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        // 查询订单
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());
        // 判断订单存在并且处于待接单的状态
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders = Orders.builder()
                .id(ordersRejectionDTO.getId())
                .status(Orders.CANCELLED)
                .rejectionReason(ordersRejectionDTO.getRejectionReason())
                .cancelTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    /**
     * 派送订单
     */
    @Override
    public void delivery(Long id) {
        // 查询订单
        Orders ordersDB = orderMapper.getById(id);
        // 判断订单存在，并且处于已经接单状态
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders = Orders.builder().id(id).status(Orders.DELIVERY_IN_PROGRESS).build();
        orderMapper.update(orders);
    }
}
